Multifrequency survey of the intergalactic cloud in the M96 group

Details Multifrequency survey of the intergalactic cloud in the M96 group Multifrequency survey of the intergalactic cloud in the M96 group

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..666s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 666-673.

Astronomy and Astrophysics

Astronomy

53

Emission Spectra, Intergalactic Media, Molecular Clouds, Spiral Galaxies, Charge Coupled Devices, Cosmic Dust, Cosmic Gases, H Lines, Stellar Activity, Very Large Array (Vla)

Scientific paper

The intergalactic cloud of neutral hydrogen in the M96 group are examined for signs of emission over a wide range of frequencies, from radio waves to X rays. Past or present stellar activity in the gas might have been expected to produce detectable visual infrared, CO, OH, or radio recombination-line emission. None was detected. The limits are used to study physical conditions in the intergalactic gas. In particular, B and V band limits on starlight and IRAS limits on the presence of dust strongly constrain the presence of stars or stellar by-products. However, given the uncertainties about physical conditions in the intergalactic environment, it is difficult to rule out entirely the presence of stellar-processed materials. Results of neutral hydrogen mapping from a large-scale survey of the intergalactic cloud and surrounding region are also presented. These observations confirm that the gas is confined to a large ringlike structure. The simplest interpretation remains that the intergalactic gas in Leo is primordial.

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